Door-lock.



J T. GRZYBOWSKI.

DOOR LOOK. APPLIOATI ON FILED FEKZ, 1911.

v Patented Feb. 13, 1912. III: IEIET- i. q

UNITED STATES PATENT OFFICE.

JULIAN '1. GRZYBOWSKI, OF GRAND RAPIDS, MICHIGAN.

DOOR-LOCK.

To all whom it may concern:

Be it known that I, JULIAN T. GRZYBO\V SKI, a citizen of the UnitedStates, residing at Grand Rapids, in the county of Kent and State ofMichigan, have invented certain new and useful Improvements in Door-Locks, of which the following is a specification, reference being had tothe accompanying drawings. 7

This invention relates to improvements in door locks and especially withreference to the provision of improved means to prevent the key fromdropping from the keyhole and getting lost or being removed by childrenand also for retaining the key in the look so that it cannot be turnedor pushed out by a person who unlawfully attempts to enter through thedoor on which my improved lock is used.

The invention consists in the construction, combination and arrangementof devices hereinafter described and claimed.

In the accompanying drawings Figure 1 is a side elevation of a port-ionof a door provided with a lock with my improved key retaining devicesshowing'the key retaining slide in raised, disengaged position; Fig. 2is a similar view of the same showing the key retaining slide inlowered, engaged position and showing the key in cross section; Fig. 8is an elevation, showing the inner side of the plate provided with mykey retain ing slide; Fig. 1 is a vertical sectional view on the planeindicated by the line a;a of Fig. 2.

The lock which is here indicated at 1 is a mortise lock, in the door 2,and may be made of any suitable construction but in accordance with myinvention the key 3 of the lock has a reduced neck 4.

In the embodiment of my invention I provide a key retaining slide 5which is movable across the circular portion 6 of the keyhole .7. Theretaining slide 5 may be mounted in any suitable manner and by anysuitable means and may be attached directly to the lock case where thelock is applied to the surface of a door. In the present instance andfor the purposes of this specification I show my improved retainingslide on the inner side of a plate 8, which plate has a bearing 9 forthe knob and also has a keyhole 10 which is coincident with that of thelook. This plate is secured on the inner side of the door and isprovided at a suitable distance from the keyhole with Specification ofLetters Patent.

Application filed February 2, 1911.

Patented Feb. 13, 1912.

Serial No. 606,167.

projects into the slot 12 and co-acts therewith to guide the slidetoward and from the keyhole. This pin has a head formed on one enddisposed between the inner face of the plate 8 and the face of the door.Thus, in the event that the pin becomes loosened in said plate, it willnot be entirely displaced therefrom so that its loss and the resultanterratic movement of the sliding plate 5 is obviated. The slide isprovided with a screw 14; which engages a threaded opening thereof andthe shank of which operates in the slot 11, the screw being provided atits outer end with a milled head 15 whereby it may be readily turned andalso being provided with an annular shoulder 16.

The screw serves as a handle for operating the slide so as to raise thelatter entirely clear of the keyhole or to lower the slide so as tocause its slotted end to extend across the circular portion of thekeyhole and hence cause the slot 12 of the slide to engage the neck ofthe key, thereby preventing the key from being turned in the lock andalso preventing it from being withdrawn from the keyhole from the innerside of the door or pushed out of the keyhole by an instrument insertedfrom the outer side of the door. By partly turning the screw theshoulder 16 may be caused to bear against the outer side of the plate soas to firmly clamp the slide in any desired, adjusted position. Hence bypartly turning the screw in one direction the slide may be locked,either when it is in its lowered position, engaged with the neck of thekey, or in its raised position so as to release the key.

Assuming that the slide is in its raised position, when the key isinserted in the keyhole it may be turned so as to operate the lock. Whenit is desired to secure the key in the keyhole, prevent it from beingturned, and also prevent it from being taken out, the screw is partlyturned in one direction so as to release the slide, the slide is thenlowered so as to engage its slot 12 with the neck of the key and thescrew is then turned in the reverse direct-ion so as to clamp the slideto the plate 8 with the slide in such lowered position.

It will be readily understood that my improved key retaining devicesenable the key to be secured in the keyhole and in the lock so that itcannot be turned and so that it cannot drop out of the keyhole or becasually removed therefrom. Moreover when the key is in the lock and issecured in place by the slide the key cannot be turned by a person onthe outer side of the door, nor can it be pushed out of the keyhole,andhence my improved device renders the lock practically burglarproof.

Having thus described my invention I claim:

The combination with a lock plate adapted to be secured to a door inspaced relation thereto, said plate having a key hole and a verticalslot therein above the key hole, of a slide movable upon the inner faceof said plate and spaced from the door, a threaded pin fixed in one endof said slide and projecting through the vertical slot in said lockplate, a head threaded upon the outer end of said pin and adapted tobind against the face of the plate to rigidly secure the slide againstmovement, said slide having a longitudinal slot open at its lower end toreceive the shank of a key, and a guide stud fixed in said lock plateadjacent the lower end of the slot therein and projecting inwardly, saidstud extending through the slot of said slide and having a head formedon its inner, end disposed between the slide and the face of the door tomaintain said slide upon the locking plate and the slot thereof inalinementwith the key shank.

In testimony whereof I hereunto affix my signature in the presence oftwo witnesses.

JULIAN T. GRZYBOXVSKI.

Witnesses F. E. BURLEsoN, F. G. VVA'rnRoUs.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

